'Mightily' in the Bible

And why will ye harden your heart, as the Egyptians and Pharaoh hardened their heart? When he had wrought mightily among them, did they not let them go, and they departed?

Then the Spirit of the Lord will come upon you mightily, and you shall prophesy with them and be changed into another man.

When they came to the hill there, behold, a group of prophets met him; and the Spirit of God came upon him mightily, so that he prophesied among them.

Then the Spirit of God came upon Saul mightily when he heard these words, and he became very angry.

Then Samuel took the horn of oil and anointed him in the midst of his brothers; and the Spirit of the Lord came mightily upon David from that day forward. And Samuel arose and went to Ramah.

Now it came about on the next day that an evil spirit from God came mightily upon Saul, and he raved in the midst of the house, while David was playing the harp with his hand, as usual; and a spear was in Saul’s hand.

Then Saul said to David, Blessed be thou, my son David: thou shalt both do mightily, and shalt surely prevail. So David went his way, and Saul returned to his place.